I have to agree with the shape cutters and decorative scissors being some of the worst purchases I made! ICK. I also invested a huge amount of $ in scrapbooking stuff before I realized I just like making cards and gifts better than I like scrapbooking. All those cute stickers remain unused in their tidy photo box marked STICKERS.
My heavy duty Carl Cutter for large swaps/workshops and my 50+ matching photo boxes for storage on matching bookshelves was the best investment in my business! I save time with the cutter and I am able to show my husband and customers that it is possible to have a tidy craft room (shoving it in neatly labeled attractive photos boxes WORKS for me!).
The SU color families of coordinating paper, inks, markers and the craft scissors are some of the best purchases. I love all my stuff to coordinate!